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Old 06-20-2018, 12:13 PM   #9 (permalink)
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Originally Posted by oil pan 4 View Post
A $30 battery isn't going to be able to start the car during the winter.
4 cells of LiFePO4 is perfect for lead acid replacement based on system voltage. It doesn't over charge but gets a near full charge.
They are supposed to be more abuse tolerant, less catastrophic failure prone.
I'd pair it with supercaps and a resistor I already have.

Originally Posted by Stubby79 View Post
Is there any particular reason you want to go "unmanaged"? PCBs are pretty cheap. Like $10-20 cheap. For that much, it seems like good insurance.
Not sure how that would work since starting requires several hundred amps. If I remember correctly, the BMS has a decent bit of phantom power draw too. If I'm undersizing the battery, I can't have large phantom loads.
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